Three hours a day is quite enough,” wrote John Maynard Keynes in his 1930 essay Economic Possibilities for our Grandchildren. The essay continues to tantalise its readers today, thanks in part to a forecast that is looking magnificently right — that in advanced economies people could be up to eight times better off in 2030 than in 1930 — coupled with a forecast that is looking spectacularly wrong, that we would be working 15-hour weeks.
約翰•梅納德•凱恩斯(John Maynard Keynes)曾在1930年的一篇短文《我們子孫後代的經濟可能性》(Economic Possibilities for our Grandchildren)中寫道：「每天3小時就足夠了。」這篇短文現在仍吸引著讀者，部分原因是一項看上去極其正確的預測：到2030年，發達經濟體國民的富裕程度可能會達到1930年的8倍，還有一項看上去極其錯誤的預測：我們將每週工作15小時。
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